SDO_GEOM.SDO_MBC

Note:

This feature is available starting with Oracle Database 12c Release 1 (12.1.0.2).

Format

SDO_GEOM.SDO_MBC_CENTER(     
  geom   IN SDO_GEOMETRY,      
  dim    IN SDO_DIM_ARRAY      
) RETURN SDO_GEOMETRY;

or

SDO_GEOM.SDO_MBC_CENTER(     
  geom   IN SDO_GEOMETRY,      
  tol    IN NUMBER       
) RETURN SDO_GEOMETRY;

Description

Returns the center of the minimum bounding circle (MBC) of a geometry object.

Parameters

geom: Geometry object.
dim: Dimensional information array corresponding to geom, usually selected from one of the xxx_SDO_GEOM_METADATA views (described in Geometry Metadata Views).
tol: Tolerance value (see Tolerance).

Usage Notes

The minimum bounding circle is the circle that minimally encloses the geometry.

If the geometry (geom) contains any arc elements, the function calculates the minimum bounding rectangle (MBR) for each arc element and uses these MBRs in calculating the minimum bounding circle of the geometry.

Examples

The following example returns a point geometry object that is the center of the minimum bounding circle of cola_a. (The example uses the definitions and data from Simple Example: Inserting_ Indexing_ and Querying Spatial Data.)

-- Return the MBC center of cola_a.
SQL> SELECT c.name, SDO_GEOM.SDO_MBC_CENTER(c.shape, 0.005) FROM cola_markets c
  2  	WHERE c.name = 'cola_a';
 
NAME                                                                            
--------------------------------                                                
SDO_GEOM.SDO_MBC_CENTER(C.SHAPE,0.005)(SDO_GTYPE, SDO_SRID, SDO_POINT(X, Y, Z), 
--------------------------------------------------------------------------------
cola_a                                                                          
SDO_GEOMETRY(2001, NULL, NULL, SDO_ELEM_INFO_ARRAY(1, 1, 1), SDO_ORDINATE_ARRAY(
3, 4))